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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03ad91c2dff6c7b003a114a159a1b7d95c9ff2ab3b1ed06c36b5e1184ba82f4' 
  AND token = 'cUKTe/5afJY9j6dl+0/FvTkAgeOhdMBDm5QqyT3LqDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}